This video purportedly shows the explosion that sparked a four-day long police presence in a Cambridgeshire village.

Villagers in Girton reported hearing a loud bang which shook their windows last week.

It sparked a huge police response and the arrest of a 51-year-old man on suspicion of committing offences under the Explosives Act, the man has since been released under investigation.

The recent scare in Girton was sparked when the 51-year-old science tutor carried out a chemistry experiment in his garden which went wrong, his family claim.

Neighbours reported hearing a 'humongous' bang, and the following Tuesday (November 27) police wearing gas masks and chemical experts swooped on St Vincent's Close in the village of Girton, Cambridge and some residents were hastily evacuated from their homes.

The video of the experiment is in what appears to be his back garden (Image: Cambridge News)

However the family of the arrested man – who asked not to be named – claimed it had all been a huge mistake.

They said he had only been carrying out a scientific experiment in his garden which he had uploaded onto Facebook for his pupils.

They said he reported the bang to police and had videoed the explosion at 7.00pm on Nov 22 and uploaded to the internet the following day.